bytecodealliance/wasmtime

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A lightweight WebAssembly runtime that is fast, secure, and standards-compliant

Stars: 18.6k
Forks: 1.8k
Open beginner issues: 0
Indexed issues: 770
Avg merge: 1d 14h
Merged PRs (30d): 135

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Sep 14, 2026
Latest indexed: Sep 14, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue help wanted

Open All

762 open issues indexed

c-api: component-model: Byte array Open

wasm-proposal:component-model wasmtime:c-api

bytecodealliance/wasmtime#11617 · 1 comment · 3 reactions · 0 assignees · Indexed Sep 14, 2026
wasip3 filesystem: Opening dir with MUTATE_DIRECTORY but not READ doesn't preserve MUTATE_DIRECTORY Open

bug wasi wasi:impl

bytecodealliance/wasmtime#11667 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
support accessing the store in `bindgen!` in `no_std` contexts for synchronous imports Open

wasm-proposal:component-model wasmtime:platform-support

bytecodealliance/wasmtime#11705 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Missed optimizations Open

bytecodealliance/wasmtime#11722 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Missed optimization: `clz` and `ctz` Open

bytecodealliance/wasmtime#11725 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Consider integrating `ecmascript_atomics` crate Open

wasm-proposal:threads

bytecodealliance/wasmtime#11747 · 1 comment · 6 reactions · 0 assignees · Indexed Sep 14, 2026
WASIp3 http/fields does not preserve case Open

bug wasi:impl

bytecodealliance/wasmtime#11770 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
WASIp3 HTTP: Inconsistent errors when adding invalid field names Open

bug wasi:impl

bytecodealliance/wasmtime#11771 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
WASIp3 request#set-method is more restrictive than RFC 9110 Open

bug wasi:impl

bytecodealliance/wasmtime#11772 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
WASIp3 request#set-scheme is more lenient than RFC 9110 Open

bug wasi:impl wasi:spec

bytecodealliance/wasmtime#11778 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 14, 2026
WASIp3 HTTP request path-and-query is more lenient than RFC 3986 Open

bug wasi:impl

bytecodealliance/wasmtime#11779 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
WASIp3 set-path-and-query normalizes an empty path for `OPTIONS` Open

bug wasi:impl wasi:spec

bytecodealliance/wasmtime#11780 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
"Couldn't materialize" any expression on macOS with LLDB Open

bug wasmtime:debugging

bytecodealliance/wasmtime#11830 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Add API for cancelling tasks started using `[Typed]Func::call_concurrent` Open

wasm-proposal:component-model-async

bytecodealliance/wasmtime#11833 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Guest debugging: track precise GC types in metadata Open

wasmtime:debugging

bytecodealliance/wasmtime#11847 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Async libcalls "block" the store from making progress on concurrent tasks Open

wasm-proposal:component-model-async

bytecodealliance/wasmtime#11869 · 10 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Functions defined with `wrap_async` and various variants "block" the store from making progress on concurrent tasks Open

wasm-proposal:component-model-async

bytecodealliance/wasmtime#11870 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Debugging: build an async debugger API on top of `run_concurrent` Open

bytecodealliance/wasmtime#11896 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[coop-threading] Convert tests to wast Open

wasm-proposal:component-threading

bytecodealliance/wasmtime#11908 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[coop-threading] Extensive testing Open

wasm-proposal:component-threading

bytecodealliance/wasmtime#11909 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
[coop-threading] Match trap conditions against spec Open

wasm-proposal:component-threading

bytecodealliance/wasmtime#11910 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
winch(aarch64): Wide arithmetic Open

winch

bytecodealliance/wasmtime#11929 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
c-api: Dealing with lists is inconsistent across APIs Open

wasmtime:c-api

bytecodealliance/wasmtime#11940 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: Potentially impossible to implement the C ABI on ARM64 due to lack of ArgumentPurpose::StructArgument support. Open

bug cranelift

bytecodealliance/wasmtime#11951 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Support mmap flag MAP_JIT for MACOS Open

wasmtime:platform-support

bytecodealliance/wasmtime#11989 · 14 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: use target-specific cost functions for egraph extraction Open

cranelift cranelift:goal:optimize-speed

bytecodealliance/wasmtime#12005 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Support load sinking across notrap loads Open

cranelift:area:x64

bytecodealliance/wasmtime#12033 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Use cargo publish --workspace instead of a custom publish script Open

bytecodealliance/wasmtime#12055 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Seeking for a possible work around of a removed feature related to tables Open

wasmtime:c-api

bytecodealliance/wasmtime#12056 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Atomic instructions are not fuzzed Open

fuzzing wasm-proposal:threads

bytecodealliance/wasmtime#12067 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Handle OOM in the runtime Open

wasmtime:platform-support

bytecodealliance/wasmtime#12069 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Allow using TLSDESC TLS access for ELF on x86 and riscv Open

cranelift cranelift:area:riscv64 cranelift:area:x86

bytecodealliance/wasmtime#12087 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cannot cancel a host-initiated read of a future Open

wasm-proposal:component-model-async

bytecodealliance/wasmtime#12090 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Adding a "close" method to `{Future,Stream}[Producer,Consumer}` traits Open

wasm-proposal:component-model-async

bytecodealliance/wasmtime#12091 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Wasmtime debugging: clone only `.text`, not whole code image Open

performance wasmtime wasmtime:debugging

bytecodealliance/wasmtime#12104 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Debugging: support registering profiling info when guest debugging is enabled. Open

wasmtime wasmtime:debugging

bytecodealliance/wasmtime#12105 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Module registry: investigate data-structure optimizations Open

performance wasmtime

bytecodealliance/wasmtime#12111 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: ISLE mid-end performance regression (-9.20%) Open

cranelift cranelift:goal:optimize-speed performance

bytecodealliance/wasmtime#12139 · 12 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: improve egraph cost function / extraction to "understand" sharing / reusing sub-expressions Open

cranelift cranelift:goal:optimize-speed

bytecodealliance/wasmtime#12156 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
x64: enable APX in Cranelift Open

cranelift:area:x64 cranelift:goal:optimize-speed

bytecodealliance/wasmtime#12157 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
CAN not run on windows 7 Open

wasmtime:platform-support

bytecodealliance/wasmtime#12168 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Windows symlink oddness Open

bug wasi wasi:impl wasi:tests

bytecodealliance/wasmtime#12172 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
macos wasi: ln -s "" "foo" succeeds Open

bug wasi wasi:impl wasi:tests

bytecodealliance/wasmtime#12173 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
windows wasi: rmdir on symlink to dir succeeds Open

bug wasi wasi:impl wasi:tests

bytecodealliance/wasmtime#12178 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Debugging: implement memory watchpoints Open

wasmtime:debugging

bytecodealliance/wasmtime#12188 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Add `matches` function to all types structs Open

wasmtime:api

bytecodealliance/wasmtime#12193 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: [RISC-V] ISLE panic "no rule matched for term gen_bitcast" Open

bug cranelift cranelift:area:riscv64

bytecodealliance/wasmtime#12195 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: Tracking Issue: Missing ISLE lowering rules and internal panics Open

bug cranelift cranelift:area:aarch64 cranelift:area:x86

bytecodealliance/wasmtime#12197 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Compiling SQL queries with Cranelift? Open

bytecodealliance/wasmtime#12238 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Analyze component instantiation to find constant values of immutable global imports Open

performance wasm-proposal:component-model wasmtime

bytecodealliance/wasmtime#12242 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026

bytecodealliance/wasmtime

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